If he is still casting this stuff on you when everyone is below 30 sanity then it is a bug and probably should let blizz know, it wouldn't be the first time they managed to break an old boss (see also: kael MC bug when 5.0 hit).
I'm doing Yogg 25 +0 with a group consisting of me and 3 others every week, goes down easily enough. It's doable with 3 people but a lot more RNG with people getting insane etc.
Also psychosis DOES hit people with under 30 sanity, if there's no other targets available. When we tried to 3 man it we often had either everyone getting down to 4-16 sanity as the first brainportal got out (without bouncing malady obviously), and most of the time we'd instead have one person going insane while one of us were at 28 sanity instead. Since everyone was below 30 sanity it casted randomly anyway.
It is however doable with 3 but considerably safer with 4 people.
I know there's been a video of a warlock soloing Yogg 25 +0, but I think it was done on the MoP beta servers (correct me if I'm wrong), and there psychosis worked as been said by a few here, that it stops casting once you reach ~30 sanity, this is however not the case on live, if intended or not I dont know. I also can't remember exactly how it was back in wotlk, but I'm pretty sure the 30 sanity "safe" thing was added at a later point (either ICC or in cata or something) to avoid getting screwed over by RNG.
Anyway if anyone has trouble doing this with 4 or so people this is what we do: 1 tank (blood DK), 3 dps (rogue, retri, mage).
P1: Just pop clouds and get through it asap, no big deal.
P2: Stay close to eachother at all times (to break constrictors, not take any sanityloss from brain link). However you need to be on the ball when someone gets malady, no problem to get OOR for it to jump though. We prio tentacles as following: constrictor > corruptor > big mofo. However if the corruptor is far away and the big one is close, we just kill that in a driveby kinda style on our way.
Everyone goes into the brainroom (however if someone has less than 10 sanity that person just stays out and keeps killing tentacles). We easily kill the brain in one go.
P3: Kill remaining corruptors and if more than 1 big tentacle up, kill those aswell. DK picks adds up, we pop BL and kill before the first heal. (When we were in lower gearlevels we had the DK pick up the adds away from the boss by getting healing aggro / dropping D&D where the 3 dpsers stood, this way the heal only hit the adds which he survived and AoEd down again on his own). Just be careful for the gaze from yogg if you're low sanity and it's cake.
Last edited by Cotech; 2013-01-03 at 03:55 PM.
It's only game. Why you heff to be med? - Ilya Bryzgalov
I could be wrong on how it operates, but that seems to tell me that it should stop casting if everyone is under 40 (I know the quote says 30, but the quote is incomplete).We've made one additional change to a specific element of the Yogg-Saron fight. Since the fight went live, there has been a hidden protection for players that prevents the casting of Psychosis and Malady of the Mind on targets with less than 30 Sanity
I mentioned Malady because you said "loss of sanity that jumps from a player to another". The only thing in the fight that jumps is Malady.
---------- Post added 2013-01-04 at 03:06 AM ----------
Then it appears to be a change that wasn't mentioned in recent patches, just like the Brunnhildar Axe (1 hand) no longer having the trademark 4-6 frost damage per hit like all the other Brunnhildar weapons. Most likely done to make it too difficult to solo with the ever increasing gear we get.
Been doing Yogg'Saron 25 man with 6 people.... on our 3 week the mount drop my warrior friend won it... then she got the Onyxia drake today and will never use Mimiron's head anymore ;c Also i think it's a 4% drop rate according to some friends.